Systems and methods for providing emergency callback procedures

• US 8,369,822 B2
• Filed: 05/28/2009
• Issued: 02/05/2013
• Est. Priority Date: 05/28/2009
• Status: Expired due to Fees

• Current Assignee: AT&T Intellectual Property I LP (AT&T, Inc.)
• Original Assignee: AT&T Intellectual Property I LP (AT&T, Inc.)
• Inventors: Hursey, John
• Primary Examiner(s): Kincaid, Lester
• Assistant Examiner(s): Gu, Andy
• Application Number:
  US12/473,382
• Publication Number:
  US 20100304705A1
• Time in Patent Office: 1,349 Days
• Field of Search: 455/404.1
• US Class Current: 455/404.1
• CPC Class Codes: H04M 11/04 with alarm systems, e.g. fire, police or burglar alarm systems
• CPC Class Codes: H04M 3/38 Graded-service arrangements, i.e. some subscribers prevented from establishing certain connections queuing arrangements H04Q3/64
• CPC Class Codes: H04W 4/90 Services for handling of emergency or hazardous situations, e.g. earthquake and tsunami warning systems [ETWS]
• CPC Class Codes: H04W 76/19 Connection re-establishment
• CPC Class Codes: H04W 76/50 for emergency connections
• CPC Class Codes: H04W 8/26 Network addressing or numbering for mobility support

Abstract

Enhanced services, such as call restriction, call forwarding, anonymous call rejection, and proprietary services, may interfere with an emergency callback potentially preventing the callback from reaching the intended destination. Systems and methods for processing emergency calls to eliminate emergency callback failure in response to an emergency call being released are provided herein.

Claims

1. A method for operating a gateway mobile switching center to execute an emergency callback to a mobile device, the method comprising:

processing, at the gateway mobile switching center, an emergency callback received from a public safety answering point in response to an unexpected release of an established emergency call between the public safety answering point and the mobile device to reestablish communication between the public safety answering point and the mobile device;

issuing, at the gateway mobile switching center, a special-use send routing information message to a home location register, the special-use send routing information message comprising a parameter to suppress a call blocking feature enabled for a calling party of the emergency call;

processing, at the gateway mobile switching center, a send routing information response message received from the home location register in response to the special-use send routing information message, the send routing information response message comprising a mobile station roaming number; and

routing, at the gateway mobile switching center, the emergency callback to a serving mobile switching center based upon the mobile station roaming number.

2. The method of claim 1, wherein the processing comprises processing, at the gateway mobile switching center, the emergency callback received from the public safety answering point in response to the unexpected release of the emergency call, the emergency callback comprising a calling party number set to a number for the public safety answering point and a calling party category value.

3. The method of claim 1, wherein the processing comprises processing, at the gateway mobile switching center, the emergency callback received from the public safety answering point in response to the unexpected release of the emergency call, the emergency callback comprising a called party number set to a temporary routing number.

4. The method of claim 3, further comprising:

transmitting, at the gateway mobile switching center, a request to an emergency callback platform for a mobile subscriber integrated services digital network number that matches the temporary routing number; and

receiving, at the gateway mobile switching center, a response from the emergency callback platform, the response comprising the mobile subscriber integrated services digital network number and a calling party category set to emergency service call.

5. The method of claim 1, wherein the issuing comprises issuing the special-use send routing information message to the home location register, the special-use send routing information message comprising the parameter configured to suppress a call restriction service.

6. The method of claim 5, wherein the special-use send routing information message comprises the parameter configured to suppress the call restriction service selected from the group comprising a call forwarding service, a bar all incoming calls service, an anonymous call rejection service, an intelligent networking service, and a proprietary service.

7. A gateway mobile switching center for delivering an emergency callback comprising:

a processor; and

a memory, in communication with the processor, the memory storing instructions that, when executed, perform a method comprising;

processing an emergency callback received from a public safety answering point in response to an unexpected release of an emergency call;

issuing a special-use send routing information message to a home location register, the send routing information message comprising a parameter to suppress a call blocking feature enabled for an emergency calling party;

processing a send routing information response message received from the home location register in response to the send routing information message, the send routing information response message comprising a mobile station roaming number; and

routing the emergency callback to a serving mobile switching center based upon the mobile station roaming number.

8. The system of claim 7, wherein the processing comprises processing the emergency callback comprising a calling party number set to a number for the public safety answering point and a calling party category value.

9. The system of claim 7, wherein the processing comprises processing the emergency callback, the emergency callback comprising a called party number set to a temporary routing number.

10. The system of claim 9, wherein the memory further stores instructions that, when executed, perform:

transmitting a query to an emergency callback platform to request a mobile subscriber integrated services digital network number that matches the temporary routing number; and

receiving a query response from the emergency callback platform, the query response comprising the mobile subscriber integrated services digital network number and a calling party category set to emergency service call.

11. The system of claim 7, wherein the issuing comprises issuing the special-use send routing information message to the home location register, the special-use send routing information message comprising the protective parameter configured to suppress a call restriction service.

12. The system of claim 11, wherein the special-use send routing information message comprises the parameter configured to suppress the call restriction service selected from the group comprising a call forwarding service, a bar all incoming calls service, an anonymous call rejection service, an intelligent network service, and a proprietary service.

13. A method for operating an emergency callback platform, the method comprising:

processing, at the emergency callback platform, a request received from a gateway mobile switching center, the request being for a mobile subscriber integrated services digital network number that matches a temporary routing number included in the request;

determining, at the emergency callback platform, the mobile subscriber integrated services digital network that matches the temporary routing number; and

issuing, at the emergency callback platform, a response to the gateway mobile switching center, the response comprising the mobile subscriber integrated services digital network and a calling party category value, wherein the calling party category value is set to emergency service call, wherein the gateway mobile switching center issues a special-use send routing information message to a home location register, the special-use send routing information message comprising a parameter to suppress a call blocking feature enabled for a calling party of an emergency call.

14. A method for operating a location register to deliver an emergency callback, the method comprising:

processing, at a location register, a special-use send routing information message received from a gateway mobile switching center, the send routing information message comprising a parameter to suppress a call blocking feature enabled for an emergency calling party;

suppressing, at the location register, the call blocking feature in accordance with the parameter such that the call blocking feature does not interfere with an emergency callback procedure to a mobile device associated with the emergency calling party;

communicating, by the location register, with a serving mobile switching to retrieve a mobile station roaming number; and

issuing, at the location register, a send routing information response message to the gateway mobile switching center, the send routing information response message comprising the mobile station roaming number.

15. The method of claim 14, wherein the suppressing comprises suppressing the call blocking feature, the call blocking feature being selected from the group comprising a call forwarding service, a bar all incoming calls service, an anonymous call rejection service, an intelligent network service, and a proprietary service.

16. A method for handling an emergency callback in an internet protocol multimedia subsystem network, the method comprising:

in response to an unexpected release of an emergency call, receiving, at the internet protocol multimedia subsystem network, an emergency callback at a callback gateway, the emergency callback comprising a called party number field populated with a temporary callback number and a calling party number field populated with a number for a public safety answering point handling the emergency call;

wherein the temporary callback number is received by the public safety answering point in response to the public safety answering point sending an emergency services positioning request to a gateway mobile location center and, wherein the temporary callback number is matched to a mobile subscriber integrated services digital network number of an emergency calling party and the match is maintained by the gateway mobile location center;

generating, at the Internet protocol multimedia subsystem network, a special session initiation protocol invite and directing the special session initiation protocol invite to an emergency callback application server;

wherein the emergency callback application server previously received a first data update from the gateway mobile location center, the first data update comprising the temporary callback number and the corresponding mobile subscriber integrated services digital network number for the emergency calling party and, wherein the emergency callback application server previously received a second data update from the gateway mobile location center, the second data update comprising a call termination notice to inform the emergency callback application server the emergency call has been terminated;

generating, at the emergency callback application server, a special-use send routing information message that is directed to a location register, the special-use send routing information message comprising a parameter to suppress a call blocking feature enabled for the emergency calling party;

generating, at the emergency callback application server, an invite message directed to the internet protocol multimedia subsystem network, the invite message comprising a mobile station routing number in a to field of the invite message and the public safety answering point number tagged as a emergency in a from field of the invite message;

wherein the mobile station routing number is received by the emergency callback application server in a send routing information acknowledgement message sent from the location register and, wherein the mobile station routing number obtained by the location register during a provide routing number process executed between the location register and a serving mobile switching center; and

sending, via the internet protocol multimedia subsystem network a modified emergency callback to the serving mobile switching center to connect the emergency call, the modified emergency callback comprising the mobile station routing number the calling party number and any calling party category data.